Sea Mills is a suburb of Bristol, England, 3.5 miles (6 km) north-west of the city centre, between the former villages of Shirehampton, Westbury-on-Trym and Stoke Bishop, by the mouth of the River Trym where it joins the River Avon.
For elections to Bristol City Council, central and southeastern Sea Mills is in the Stoke Bishop electoral ward,[1] while northwestern Sea Mills is in the Avonmouth and Lawrence Weston ward, with the A4162 Sylvan Way road forming the ward boundary.[2] Before 2016, Sea Mills was in Kingsweston ward.